How to solidify on Blender without distortion

Simple, but my dumb brain can’t seem to figure it out. Here’s a picture of what I mean:

The sooner the response, the better, thanks.

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its called shading error in blender
Have you try edge spilt yet?
image

So basically there is a function that blender has called Shade smooth
In a nutshell, it makes sharp edges look like smooth edges

It looks sort like this

To fix this, tick autosmooth and set an angle, this angle is the minimum angle
that it tries to smooth a sharp edge, the greater it is, the more edges that will be smooth`d

Try experimenting, use anything between 30 to 45 and see how that helps

After autosmooth

can you show us how the faces are oriented?

oopsie wrong reply

You could try Mesh > Normals > Reset Vectors. If those windows have hard 90-degree edges, select the edges around it and try Edge > Mark Sharp.

Alright, it worked very well! Thank you!